ML20212D552

Amend 200 to License DPR-51,changing Affected Requirements for Station Batteries & Swithyard Distribution Sys non-class E 125 Volt Direct Current (DC) Sources

ML20212D552
Person / Time
Site:	Arkansas Nuclear
Issue date:	09/14/1999
From:	Gramm R NRC (Affiliation Not Assigned)
To:
Shared Package
ML20212D559	List: ML20212D552 ML20212D561
References
NUDOCS 9909240002
Download: ML20212D552 (14)

Text

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UNITED STATES

'j NUCLEAR REGULATORY COMMISSION f

WASHIN(IUA

').C. 20555 4001

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i ENTERGY OPERATIONS INC.

j DOCKET NO. 50-313 ARKANSAS NUCLEAR ONE. UNIT NO.1 i

i AMENDMENT TO FACILITY OPERATING LICENSE Amendment No. 200 License No. DPR-51

)

1.

The Nuclear Regulatory Commission (the Commission) has found that:

A.

The application for amendment by Entergy Operations, Inc. (the licensee) dated l

April 9,1999, as supplemented July 29,1999, complies with the standards and requirements of the Atomic Energy Act of 1954, as amended (the Act), and the Commission's rules and regulations set forth in 10 CFR Chapter I; B.

The facility will operate in conformity with the application, the provisions of the Act, and the rules and regulations of the Commission; C.

There is reasonable assurance (i) that the activities authorized by this amendment can be conducted without endangering the health and safety of the public, and (ii) that such activities will be conducted in compliance with the Commission's regulations; D.

The issuance of this license amendment will not be inimical to the common defense and security or to the health and safety of the public; and E.

The issuance of this amendment is in accordance with 10 CFR Part 51 of the Commission's regulations and all applicable requirements have been satisfied.

i l

9909240002 990914 PDR ADOCK 05000313 P

PDR 1:

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Accordingly, Facility Operating License No. DPR-51 is hereby amended to approve the relocation of certain Technical Specification requirements to the Technical Requirements Manual, as described in the licensee's application dated April 9,1999, as supplemented July 29,1999, and evaluated in the staff's Safety Evaluation attached to this amendment. This Technical Requirements Manual revision shall be reflected in the next update of the Updated Final Safety Analysis Report submitted to the NRC, pursuant to 10 CFR 50.71(e). The license is also hereby amended by changes to the Technical Specifications as indicated in the attachment to this license amendment, and paragraph 2.C.(2) of Facility Operating License No. DPR-51 is hereby amended to read as follows:

i

2. Technical Soecifications The Technical Specifications contained in Appendix A, as revised through Amendment No. 200, are hereby incorporated in the license. The licensee shall operate the facility in accordance with the Technical Specifications.

3.

The license amendment is effective as of its date of issuance and shall be implemented within 45 days from the date of issuance (including issuance of the Technical Requirements Manual for use by licensee personnel).

FOR THE NUCLEAR REGULATORY COMMISSION

{J (f, g\\ y f~

Robert A. Gramm, Chief, Section 1 Project Directorate IV & Decommissioning Division of Licensing Project Management Office of Nuclear Reactor Regulation

Attachment:

Changes to the Technical Specifications Date of Issuance:

September 14, 1999

1 4

ATTACHMENT TO LICENSE AMENDMENT NO.200 FACILITY OPERATING LICENSE NO. DPR-51 DOCKET NO. 50-313 Replace the following pages of the Appendix A Technical Specifications with the attached revised pages. The revised pages are identified by amendment number and contain marginal lines indicating the areas of change.

Remove Insert 56 56 57 57 57a 57a 57b 57c 100a 100a 100b 101 101 101a 101b 101c i:

e 9

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3.1 Auxiliary Electrical Systems Applicability

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Applies to the auxiliary electrical power systems.

Objectives To specify conditions of operation for plant station power necessary to ensure safe reactor operation and combined availability of the engineered safety features.

Specifications 3.7.1 The reactor shall not be heated or maintained above 200*F unless the following conditions are met (except as perndtted by Paragraph 3.7.2):

A.

Any one of the following combinations of power sources operable:

1.

Startup Transformer No. I and Startup Transformer No. 2.

2.

Startup Transformer No. 2 and Unit Auxiliary Transformer provided that the latter one is connected to the 22KV line from the switchyard rather than to the generator bus.

B.

All 4160 V switchgear, 480 V load centers, 480 V motor control centers and 120 V AC distribution panels in both of the ESAS distribution systems are operable and are being powered from either one of the two startup transformers or the unit auxiliary transformer.

C.

Both diesel generator sets are operable each withe 1.

a separate day tank containing a minimum of 160 gallons of

fuel, 2.

a separate amergency storage tank containing a mintmum of 138 inches (20,000 gallons) of fuel, 3.

a separate fuel transfer pump, and 4.

a separate starting air compressor.

D.

DELETED l

E.

DELETED l

F.

The off-site power undervoltage and protective relaying interlocks associated with required startup transformer power sources shall be operable per Table 3.5.1-1.

G.

The selective load-shed features associated with Startup Transformer No. 2 shall be operable if selected for auto transfer.

Amendment No. M,60,-1-M, 200 56

I 3.7.2 A.

The specifications in 3.7.1 may be modified to allow one of the following conditions to exist after the reactor has bee'n heated above 200r. Except as indicated in the following conditions, if any of these conditions are not met, a hot I

shutdown shall be initiated within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />. If the condition is r.ot cleared within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, the reactor shall be brought to cold shutdown within an additional 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

B.

In the event that one of the offsite power sources specified in 3.7.1.A (1 or 2) is inoperable, reactor operation may continue for up to 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> if the availability of the diesel generators is immediately verified.

C.

Either one of the two diesel generators may be inoperable for up to 7 days in any month provided that during such 7 days the operability of the remaining diesel generator is demonstrated immediately and daily thereafter, there are no inoperable Esr components associated with the operable diesel generator, and provided that the two sources of off-site power specified in

3. 7.1. A (1) or 3.7.1.A(2) are available.

D.

Any 4160V, 400V, or 120V switchgear, load center, motor control center, or distribution panel in one of the two ESF distribution systems may be inoperable for up to 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />, provided that the operability of the diesel generator associated with the operable ESF distribution system is demonstrated Lamediately and all of the components of the operable distribution system are operable. If the EST distribution system is not returned to service at the end of the 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> period, Specification 3.7.2.A shall apply.

E.

DELETED F.

DELETED G.

DELETED H.

If the requirements of Specification 3.7.1.G cannot be met, j

either:

(1) place all Startup Transformer No. 2 feeder breakers in

" pull-to-lock" within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />, restore the inoperable interlocks to operable status within 30 days, or submit within 30 days a special Report pursuant to Specification 6.12.5 outlining the cause of the failure, proposed corrective action and schedule for implementations or (2) apply the action requirements of Table 3.5.1-1, Note 14.

Amendment No. 60,144,W,M4, 200 57

3.7.3 Seth 125 VDC electrical power subsystems shall be operable when the' unit is above the cold shutdown condition.

With one 125 VDC electrical power subsystem inoperable A.

l'.

verify that there are no inoperable safety related components associated with the operable 125 VDC electrical subsystem which are redundant to the inoperable 125 VDC electrical power subsystem, 2.

verify the operability of the diesel generator associated with the operable 125 VDC electrical subsystem immediately, and 3.

restore the 125 VDC electrical subsystem to operable status within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.

B.

With one 125 VDC electrical power subsystem inoperable, and unable to satisfy the requirements or allowable outage times of 3.7.3. A.1, 3.7.3.A.2, or 3.7.3.A.3, the unit shall be placed in hot shutdown within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in cold shutdown within an additional 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

3.7.4 Sattery cell parameters shall be within limits when the associated 125 VDC electrical power subsystems are required to be operable.

A.

With one or more batteries with one or more battery cell parameters not within Table 4.6-1 Category A or B limits:

1.

Within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />, verify pilot cell electrolyte level and float voltage meet Table 4.6-1 Category C limits, 2.

Within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> and once per 7 days thereafter, verify battery cell parameters meet Table 4.6-1 Category C limits, and 3.

Within 31 days, restore battery cell parameters to Table 4.6-1 Category A and B limits.

B.

With one or more batteries with one or more battery cell paramators not within Table 4.6-1 Category A or B limits and unable to satisfy the requirements or allowable outage times of 3.7.4.A.1, 3.7.4.A.2, or 3.7.4.A.3, declare the associated battery inoperable immediately and perform the required actions of 3.7.3.A.

C.

With one,or more batteries with electrolyte temperature of the pilot cell not within the limits of specification 4.6.2.8, electrolyte temperature of representative cells not within the limits of specification 4.6.2.6 or with one or more batteries with one or more battery cell parameters not within Table 4.6-1 Category C limits, declare the associated battery inoperable immediately and perform the required actions of 3.7.3. A.

Bases The electrical system is designed to be electrica'lly self-sufficient and provide adequate, reliable power sources for all electrical equipment during startup, normal operation, safe shutdown and handling of all emergency situations. To prevent the concurrent loss of all auxiliary power, the I

various sources of power are independent of and isolated from each other.

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Amendment No. M,44,M4, 200 57a

In the event that the offsite power sources specified in 3.7.1.A (1 or 2) are inoperable, the required capacity of one emergency storage tank plus one, will be sufficient for not less than three and day tank (20,160 gallons) one-half days operation for one diesel generator loaded to full capacity.

(ANO-1 FSAR 8.2.2.3) The underground emergency storage tanks are gravity fed while the day tanks are from the bulk storage tank and are normally fula, fed from transfer pumps which are capable of being cross connected at their suction and discharges and automatically receive fuel oil when their Thus, at least a seven day total diesel inventory is less than 180 gallons.

oil inventory is available onsite for amargency diesel generator operation during complete loss of electric power conditions.

Technical Specification 3.7.2 allows for the tamporary modification of the specifications in 3.7.1 provided that backup system (s) are operable with safe reactor operation and combined availability of the engineered safety features ensured.

Technical Specifications 3.7.1.T and 3.7.1.G provide assurance that the Startup Transformer No. 2 loads will not contribute to a sustained degraded grid voltage situation. This will protect ESF equipment from damage caused by sustained undervoltage.

The 125 VDC electrical power system consists of two independent and redundant Each subsystem consists of safety related class 1E DC electrical subsystems.

and its one 100% capacity 125 VDC battery, an associated battery charger, Additionally, there is one spare battery charger per distribution network.

subsystem, which provides backup service in the event that the preferred battery charger is out of service.

If one of the required DC electrical power subsystems is inoperable (e.g.,

inoperable battery, no operable battery charger, or inoperable battery and nothe operable associated battery charger),

has the capacity to support a safe shdtdown and to mitigate an acciden in the complete loss of the remaining 125 VDC electrical power subsystems with condition.

attendant loss of ES functions, continued power operation should not exceed 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.

Battery cell parameters must ramain within acceptable limits to ens in a safe condition after an anticipated operational event or a postulated Cell parameter limits are conservatively established, design basis accident.

allowing continued DC electrical system function even with Table 4.6-1 Category A and B limits not met.

With one or more cells in one or more batteries not within limits (i.e.,

or or Category B limits not met, Table 4.6-1 Category A limits not met,but. within the Table 4.6-1 Category C limits, Category A and B limits not met)the battery is degraded but has sufi'icient capa the battery is 90t required to be considered inoperable function. Therefore, and continued operation is solely as a result of Category A or B limits not met,The pilot cell electrolyte level and permitted for a limited period of time. float voltage are required to be verified These checks will provide a quick limits within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> (TS 3.7.4.A.1).

Verification that representative status of the remainder of the battery cells.provides assurance that (75 3.7.4.A.2) the Table 4.6-1 Category C lindts are met during the time needed to restore the parameters to within the Category A and B limits, the battery will still be capable of performing its intended function.

This verification is repeated at 7 day intervals until the parameters areThis periodic restored to within Category A and B lindts.

consistent with the increased potential to exceed these battery parameter limits during these conditions.

Amendment No. 200 I

57b

r-With one or more batteries with one or more battery cell parameters outside the Table 4.6-1 Category C limit for any connected cell, suf ficient capacity to supply the maximum expected load requirement is not assured. Therefore, the battery must be immediately declared inoperable and the corresponding DC electrical power subsystem must be declared inoperable.

Additionally, other potentially extrace conditions, such as electrolyte temperature of the pilot cell falling below 60*r, average electrolyte temperature of representative cells falling below 60*r or battery terminal voltage below the limit are also cause for immediately declaring the associated DC electrical power subsystem inoperable.

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Amendment No. 200 57c l

e.

Diesel fuel from the emergency storage tank shall be sampled and found to be within acceptable limits specified in Table 1 of ASTM D975-68 when checked for viscosity, water, and sediment.

j 5.

Once every 31 days the pressure in the required starting air receiver tanks shall be verified to be 2175 psig.

Once every 18 months, the capacity of each diesel oil transfer pump shall be verified to be at least 10 gym.

4.6.2 DC Sources and Battery Cell Parameters l

1.

Verify battery terminal voltage is 2124.7 V on float charge once each 7 days.

2.

Verify battery capacity is adequate to supply, and maintain in operable status, the required emergency loads for the design duty cycle when subjected to either a battery service test or a modified performance discharge test once every 10 months.

3.

Verify battery capacity is 1 004 of the manufacturers rating when subjected to a performance discharge test or a modified performance discharge test once every 60 months, once every 24 months when battery has reached 95% of the service life with capacity 1100% of

-the manufacturers rating and showing no degradation, and once every 32 months when battery shows degradation or has reached 05% of the service life and capacity is < 100% of the manufspturer's rating.

4.

Any battery charger which has not been loaded while connected to its 125V d-c distribution system for at least 30 minutes during every quarter shall be tested and loaded while connected to its bus for 30 minutes.

]

5.

Verify battery pilot cell parameters meet Table 4.6-1 Category A j

limit" ance'per 7 days.

6.

Verify average electrolyte temperature of representative cells is l

160'r once per 92 days.

7.

Verify battery cell parameters meet Table 4.6-1 Category B limits once per 92 days and once within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> after a battery discharge to < 110 V and once within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> after a battery overcharge to

> 145 V.

8.

Verify electrolyte temperature of pilot cell is 160*r once per 31 days.

4.6.3 Emergency Lighting The correct functioning of the emergency lighting system shall be verified once every 18 months.

Amendment No. M,M,H9,M6, 200 100a

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i Table 4.6-1 (page 1 of 1)

Battery Cell Surveillance Requirements CATEGORY As CATEGORY B:

CATEGORY C:

LIMITS FOR EACH LIMITS FOR EACH ALLOWABLE LIMITS DESIGNATED PARAMETER CONNECTED CELL FOR EACH PILOT CELL CONNECTED CELL Electrolyte Level

> Minimum level

> Minimum level Above top of I

1 indication mark, indication mark, plates, and not and 5 1/4 inch and 5 1/4 inch overflowing above maximum above maximum level indication level indication ma r k

mark

Float Voltage 2 2.13 V 2 2.13 y

> 2.07 V Specific l

k 1.195 Gravity *'*'

2 1.190 Not more than O.020 below AND average connected

{

cells Average of all connected cells AND

> 1.195 Average of all connected cells 2 1.190 (a) the specified maximum during equalizing charges provide overflowing.

(b)

Corrected for electrolyte temperature.

(c)

A battery charging current of < 2 amps when on float charge is acceptable for meeting specific gravity limits following a battery recharge, maximum of 7 days.

for a When charging current is used to satisfy specific gravity requirements, specific gravity of each connected cell shall be measured prior to expiration of the 7 day allowance.

Amendment No, 200 100b l

Bases The emergency power system provides power requirements for the engineered safety features in the event of a DEA.

Each of the two diesel generators is capable of supplying minimum required engineered safety features from independent buses. This redundancy is a factor in establishing testing inte rvals. The monthly tests specified above will demonstrate operability and load capacity of the diesel generator. The fuel supply and diesel starter motor air pressure are continuously monitored and alarmed for abnormal conditions. Starting on eneplete loss of off-site power will be verified by simulated loss-of-power tests once every 18 months.

The SR 4.6.2.1 verification of battery terminal voltage while on float charge helps to ensure the effectiveness of the charging system and the ability of the batteries to perform their intended function. Float charge is the condition in which the battery charger is supplying the continuous charge required to overcome the internal losses of a battery and maintain the battery in a fully charged state. The voltage requirements are based on the nominal design voltage of the battery (2.15 y per cell average) and are consistent with the battery vendor allowable minimum volts per cell limits. The inability to meet this requirement constitutes an inoperable battery.

The 3R 4.6.2.2 battery service test is a special test of the battery capability, as found, to satisfy the design requirements (battery duty cycle) of the DC electrical power system. The discharge rate and test length should correspond to the design duty cycle requirements. A modified performance discharge test may be performed in lieu of a service test. The inability to meet this requirement constitutes an inoperable battery.

The modified performance discharge test is a simulated duty cycle consisting of just two rates; the one minute rate published for the battery or the largest current load of the duty cycle, followed by the test rate employed for the performance test, both of which envelope the duty cycle of the battery. Since the ampere-hours removed by a rated one minute discharge represents a very small portion of the battery capacity, the test rate can be changed to that for the performance test without compromising the results of the performance discharge test. The battery terminal voltage for the modified performance discharge test should remain above the minimum battery voltage specified in the battery service test for the duration of time equal to that of the service test.

A modified performance discharge test is a test of the battery capacity and its ability to provide a high rate, short duration load (usually the highest rate of the duty cycle). This will of ten confirm the battery's ability to meet the critical period of the load duty cycle, in addition to determining its percentage of rated capacity. Initial conditions for the modified performance discharge test should be identical to those specified for a service test and the test discharge rate must envelope the duty cycle of the service test if the modified performance discharge test is perforned in lieu of a service test.

The SR 4.6.2.3 battery performance discharge test is a test of constant current capacity of a battery after having been in service, to detect any change in the capacity determined by the acceptance test.

The test is intended to determine overall battery degradation due to age and usage. The inability to meet this requirament constitutes an inoperable battery.

Either the battery performance discharge test or the modified performance discharge test, described above, is acceptable for satisfying SR 4.6.2.3; however, only the modified perforwance discharge test may be used to satisfy SR 4.6.2.3 while satisfying the requirements of SR 4.6.2.2 at the same time.

Amendment No, et,36, 200 101

The acceptance criteria for this surveillance are consistent with IEEE-450. This reference recommends that the battery be replaced if its capacity is below Sol of the manufacturer's rating. A capacity of 806 shows that the battery rate of, deterioration is increasing, even if there is ample capacity to meet the load i

reqN rements.

The frequency for this test is normally 60 months. If the battery shows signs of degradation, or if the battery has reached 85% of its service life and capacity is < 100% of the manufacturer's rating, the frequency is reduced to 12 months.

However, if the battery shows no degradation but has reached 854 of its service life, the frequency is only reduced to 24 months for batteries that retain 2 loot of the manufacturer's ratings. Degradation is indicated, according to IEEE-450, when the battery capacity drops by more than lot relative to its capacity on the previous performance test or when it is 2 lot below the manufacturer's rating.

SR 4.6.2.4 requires that each required battery charger be capable of supplying the connected loads while maintaining the battery fully charged. This is based on the assumption that the batteries are fully charged at the beginning of a design basis accident, and on the safety function of providing adequate power for the design basis accident loads.

sR 4.6.2.5 verifies that the Table 4.6-1 Category A battery cell parameters are consistent with vendor recommendations and IEEE-450, which recommend regular battery inspections (at least once per month) including voltage, specific gravity, and electrolyte level of pilot cells.

The SR 4.6.2 6 verification that the average temperature of representative cells is 2 60'r is consistent with a recommendation of IEEE-450, which states that the 4

temperature of electrolytes in representative cells (-104 of all connected cells) should be determined on a quarterly basis. Lower than normal temperatures act to inhibit or reduce battery capacity. This surveillance ensures that the operating temperatures remain within an acceptable operating range. This limit is based on manufacturer recommendations.

SR 4.6.2.7 verifies that the Table 4.6-1 Category a battery cell parameters are consistent with vendor recommendations and IEEE-450, which recommend regular battery inspections (at least once per quarter) including voltage, specific gravity, and electrolyte level of each connected cell. In addition, within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> after a battery discharge to < 110 V or a battery overcharge to > 145 V, the battery must be demonstrated to meet Category 5 limits. Transients, such as motor starting transients, which may momentarily cause battery voltage to drop to E 110 V, do not constitute a battery discharge provided battery terminal voltage and float current return to pre-transient values. This inspection is also consistent with IEEE-450, which recommends special inspections following a severe discharge or overcharge, to ensure that no significant degradation of the battery occurs as a consequence of such discharge or overcharge.

The SR 4.6.2.8 verification that the temperature of the pilot cell is 2 60*F is consistent with a recommendation of IEEE-450, which states that the temperature of electrolytes in pilot cells should be determined on a monthly basis. Lower than normal temperatures act to inhibit or reduce battery capacity. This surveillance ensures that the operating temperatures remain within an acceptable operating range. This limit is based on manufacturer recommendations.

Table 4.6-1 delineates the limits on electrolyte level, cell float voltage, and specific gravity for three different categories. The meaning of each category is discussed below.

Category A defines the normal parameter limit for each designated pilot cell in each battery. The cells selected as pilot cells are those whose temperature, voltage and electrolyte specific gravity approximate the state of charge of the entire battery.

Amendment No. 200 lola l

l

The Category A limits specified for electrolyte level are based on manufacturer recommendations and are consistent with the guidance in IEEE-450, with the extra 1/4 inch allowance above the high water level indication for operating margin to account for temperatures and charge effects. In addition to this allowance, footnote (a) to Table 4.6-1 permits the electrolyte level to be above the specified maximum level during equalizing charge, provided it is not overflowing.

These limits ensure that the plates suffer no physical damage and that adequate electron transfer capability is maintained in the event of transient conditions.

IEEE-450 recommends that electrolyte level readings should be made only after the battery has been at float charge for at least 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />.

The Category A limit specified for float voltage is 2 2.13 V per cell. This value is based on the battery vendor allowable minimum cell voltage and on a recommendation of IEEE-450, which states that prolonged operation of cells

< 2.13 V can reduce the life expectancy of cells.

The category A limit specified for specific gravity for each pilot cell is k 1.195.

This value is characteristic of a charged cell with adequate capacity.

According to IEEE-450, the specific gravity readings are based on a temperature of 77'F (25'C).

The specific gravity readings are corrected for actual electrolyte temperature.

For each 3*F (1.67'C) above 77'F (25'C), 1 point (0.001) is added to the readings 1 point is subtracted for each 3*F below 77*F.

The specific gravity of the electrolyte in a cell increases with a loss of water due to electrolysis or evaporation.

Category B defines the normal parameter limits for each connected cell. The term

" connected cell' excludes any battery cell that is jumpered out.

)

The Category B limits specified for electrolyte level and float voltage are the same as those specified for Category A and have been discussed above. The Category B limit specified for specific gravity for each connected cell is 1 1.190 with the average of all connected cells > 1.195.

These values are based on manufacturer's recommendations. The minimum specific gravity value required for each cell ensures that the effects of a highly charged or newly installed cell will not mask overall degradation of the battery.

Category C defines the limits for each connected cell. These values, although reduced, provide assurance that sufficient capacity exists to perform the intended function and maintain a margin of safety. When any battery parameter is outside the category C limits, the assurance of sufficient capacity described above no longer exists and the battery must be declared inoperable.

The Category C limits specified for electrolyte level (above the top of the plates and not overflowing) ensure that the plates suffer no physical damage and maintain adequate electron trans'for capability. The Category C limit for float voltage is consistent with IEEE-450, which states that a cell voltage of 2.07 V or below, under float conditions and not caused by elevated temperature of the cell, indicates internal cell problems and may require cell replacement.

The Category C limit of average specific gravity k 1.190 is based on manufacturer recommendations. In addition to that limit, it is required that the specific gravity for each connected cell must be no less than 0.020 below the average of all connected cells. This limit ensures that the effect of a highly charged or new cell does not mask overall degradation of the battery.

Amendment No. 200 10lb l

1

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Footnotes (b) and (c) to Table 4.6-1 are applicable to Category A, B, and C specific gravity. Footnote (b) to Table 4.6-1 requires the above mentioned correction for electrolyte temperature. The value of 2 amps used in footnote (c) is the nominal value for float current established by the battery vendor as representing a fully charged battery with an allowance for overall battery condition. This current provides, in general, an indication of overall battery condition.

j Because of specific gravity gradients that are produced during the recharging process, delays of several days may occur while waiting for the specific gravity to stabilize. A stabilized charger current is an acceptable alternative to I

specific gravity measurement for determining the state of charge. This phenomenon is discussed in IEEE-450.

Footnote (c) to Table 4.6-1 allows the float charge current to be used as an alternate to specific gravity for up to 7 days following a battery recharge. Within 7 days each connected cell's specific gravity must be measured to confirm the state of charge. Following a i

minor battery recharge (such as equalizing charge that does not follow a deep dis charge) specific gr-vity gradients are not significant, and confirming measurements may be made in less than 7 days.

The SR 4.6.3 testing of the amergency lighting is scheduled every 18 months and l

is subject to review and modification if experience demonstrates a more effective test schedule.

REFERENCE FSAR, Section 8 i

Amendment No. 200 101c l

_